In the construction of heating ventilation and air conditioning projects, many pipelines are often needed to meet the needs of ventilation and heat dissipation. Therefore, in this process, the installation position of the pipelines should be accurately marked to avoid the occurrence of pipeline crossing and get rid of the impact on the quality of the project. The construction personnel should carry on the full inspection to the pipeline and conduct the prompt correction to the existence unreasonable phenomenon in order to reduce the probability of accidents. Secondly, in the process of construction, enterprises should strengthen supervision and management and install pipelines in strict accordance with the marked lines on the design drawings to improve the construction quality and avoid the phenomenon of crossing pipelines. Moreover, due to the complexity of the construction process of heating, ventilation and air conditioning projects, once the construction personnel have problems in the operation sequence, it is prone to cause the wrong installation of pipeline lines, causing the phenomenon of pipeline crossing and affecting the economic benefits of the project construction. Pipeline crossing is one of the most frequent phenomena in heating, ventilation and air conditioningengineering. Therefore, in order to better prevent this kind of phenomenon, construction enterprises should strictly control the engineering quality and install pipelines according to the pipeline line marks on the design drawings to improve the accuracy of pipeline installation.